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Adds validate_model_syntax() that rejects: - Empty strings - Strings with spaces (e.g., 'bad model') - Invalid provider/model format Accepts: - Known aliases (opus, sonnet, haiku) - Valid provider/model format (provider/model) Wired into parse_args for both --model <value> and --model=<value> forms. Errors exit with clear message before any API calls (no token burn). Verified: - 'claw --model "bad model" version' → error, exit 1 - 'claw --model "" version' → error, exit 1 - 'claw --model opus version' → works - 'claw --model anthropic/claude-opus-4-6 version' → works Refs: ROADMAP #124 (debbcbe cluster — parser-level trust gap family)